We Klingons are getting stuff, slowly but surely.
Over the course of the past year our faction has easily doubled, if not tripled our available content.
More stuff is scheduled to come out in the engineering reports, please look to them for more details.
Enhance your calm John Spartan, and allow the devs to do their jobs.

You must not have played any of the Klingon story missions. They're all as good or better than their Federation counterparts, and really have only been surpassed (and fantastically so) by the faction-neutral Featured Series missions.

When something on the KDF side seems to be done sloppy and poor made, it seems to be something "old". The new stuff is pretty fanstastic overall. And the reason the old stuff seems sloppy and poor made is because: "OMG release is coming and we aren't even finished yet with all the KDF stuff, hack it in, cut some corners, but get it done, better sloppy then nothing at all."